Tim Peake says thanks from the ISS on 23 Dec 2015

EARTH Aboard the International Space Station -- 23 Dec 2015 -- British ESA astronaut Tim Peake on the International Space Station performs an experiment with colloids. This and other experiments on the space station aim to produce better materials - as when made on Earth, gravity can cause defects in materials that should be absent in space. Peake will use high speed cameras and other sensors in the Columbus module to look how metals heated to 2000C cool and solidify. The metals made in space are brought back for studying more on Earth. -- Picture by Atlas Photo Archive/NASA